1. School of Materials Science and EngineeringUniversity of New South Wales Sydney NSW 2052 Australia
2. Division of NanophotonicsCAS Key Laboratory of Standardization and Measurement for NanotechnologyCAS Center for Excellence in NanoscienceNational Center for Nanoscience and Technology Beijing 100190 P. R. China
3. Department of Materials Science and EngineeringMonash University Clayton Victoria 3800 Australia
4. Sustainable Energy Research CentreSchool of EngineeringMacquarie University Sydney NSW 2109 Australia